Logarithmic generator (CB7593E)

This circuit has a 100 dB dynamic We found it in a Popular Electronics from the 90s. Equivalent operational can be used.

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Alarm with lock (CB8964E)
Found in a 1980s American documentation, this circuit can use a SCR and a general-purpose transistor....
Zero Crossing Detector (CB10521E)
This zero-crossing detector circuit produces an output pulse every time the input sinusoidal...
Full wave slave control (CB8156E)
Using SCRs, this circuit from a 1967 General Electric manual allows full wave load control with SCRs....